npm install react --save
There is really nothing more to it. You can now start using React JS in your code.
没什么好讲的，接下来就可以在你的代码中使用 React JS 了。
component.jsx
import React from 'react';
export default class Hello extends React.Component {
render() {
return <h1>Hello world</h1>;
}
}
main.js
import React from 'react';
import Hello from './component.jsx';
main();
function main() {
React.render(<Hello />, document.getElementById('app'));
}
build/index.html
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8"/>
</head>
<body>
<div id="app"></div>
<script src="http://localhost:8080/webpack-dev-server.js"></script>
<script src="bundle.js"></script>
</body>
</html>
To use the JSX syntax you will need webpack to transform your JavaScript. This is the job of a loader. We'll use Babel as it's nice and has plenty of features.
为了能够使用 JSX 语法，你需要用 Webpack 来转码你的 JavaScript，这是加载器的工作，我们可以使用一个很好用也有很多功能的 Babel。
npm install babel-loader --save-dev
Now we have to configure webpack to use this loader.
现在我们需要去配置 Webpack 来使用加载器。
webpack.config.js
var path = require('path');
var config = {
entry: path.resolve(__dirname, 'app/main.js'),
output: {
path: path.resolve(__dirname, 'build'),
filename: 'bundle.js'
},
module: {
loaders: [{
test: /\.jsx?$/, // 用正则来匹配文件路径，这段意思是匹配 js 或者 jsx
loader: 'babel' // 加载模块 "babel" 是 "babel-loader" 的缩写
}]
}
};
module.exports = config;
Webpack will test each path required in your code. In this project we are using ES6 module loader syntax, which means that the require path of import MyComponent from './Component.jsx'; is './Component.jsx'.
Webpack 会在你的项目中测试所有路径，如果我们项目中使用 ES6 模块加载器语法，比如 import MyComponent from './Component.jsx'; 是会去匹配 './Component.jsx'。
Run npm run dev in the console and refresh the page to see something.
在命令行中运行 npm run dev，然后刷新页面就可以看到修改。